>William writes:
>
><< Gary Reese has measured film reflectance, and I have a question for him. As
>film is exposed to light, the silver halide slowly breaks down into metallic
>silver (or undergoes other chemical changes). (You can see the darkening this
>produces by exposing the "tongue" to light for a while before loading the
>film.) This change doesn't occur rapidly, but I was wondering whether Gary
>measures reflectance "promptly" after pulling the film from the canister. >>
>
>You bet I accounted for that. I measured with a Sekonic 1 degree spot meter
>on freshly exposed to the light film surfaces.
>
>Makes for a good argument to advance the film just prior to exposure. That
>will result in more consistent (don't read accurate) OFT exposures.
>
>I'll be visiting Olympus America in the next few weeks and will bounce the
>question off them of what the baseline reflectance is for setting OFT exposure
>calibration. I can just hear John H. telling me "they won't know" :-)
>
>Gary Reese
I have also a question concerning your metering of the film reflectance,
Gary. Have you metered from the same angle as the SBC does ? I think this
is quite important, but I wasn't list member when you posted your meterings.
Matthias
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